Forged washer head bolts are used in the pole line industry. An integrated washer is forged under the square head; and hence, they provide an increased bearing surface. To prevent corrosion, these bolts are generally used with hot dip galvanized & square nuts. Washer head bolts use standard thread lengths that are usually meant for pole line fasteners. Compared to standard bolts, these tend to be longer. To facilitate easy installation, a semi-cone point is included at the threaded end.
Manufacturing
BBI manufactures quality washer head bolts the diameter of which ranges between 1/2″ and 7/8″. These bolts are manufactured so as to match the ASTM specification A307 Grade A. Our washer head bolts are forged with a square head. There is a large washer surface underneath the head. All processes including hot dip galvanizing are performed in-house.
Washer Head Bolt Dimensions
| Bolt Diameter | D | H | W | B | C | F | |||
|---|---|---|---|---|---|---|---|---|---|
| Body Diameter | Height (Head) | Height (Washer) | Outside Diameter (Washer) | Width Across Corners (Head) | Width Across Flats (Head) | ||||
| Max | Min | Basic | Max | Min | |||||
| 1⁄2 | 0.515 | 0.290 | 0.130 | 1.40 | 1.061 | 0.995 | 3⁄4 | 0.750 | 0.725 |
| 5⁄8 | 0.642 | 0.420 | 0.125 | 1.80 | 1.326 | 1.244 | 15⁄16 | 0.938 | 0.906 |
| 3⁄4 | 0.768 | 0.490 | 0.110 | 2.20 | 1.591 | 1.494 | 11⁄8 | 1.125 | 1.088 |
| 7⁄8 | 0.895 | 0.640 | 0.180 | 2.60 | 1.856 | 1.742 | 15⁄16 | 1.312 | 1.269 |